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SnapOtter 7db6bb97da docs: add per-tool API documentation and fix parity gaps

- Create 53 per-tool VitePress documentation pages with accurate
  parameters from Zod schemas, example requests, and response formats
- Add root llms.txt for LLM-friendly repo browsing
- Fix OpenAPI spec: add auth and 422 error schemas to
  edit-metadata/inspect and strip-metadata/inspect sub-routes
- Fix tool count inconsistency (52 -> 53) across landing site,
  e2e tests, and local docs
- Rename color-adjustments.ts to adjust-colors.ts to match tool ID
- Update VitePress sidebar with all 8 tool categories and top nav

2026-06-08 11:52:28 +08:00

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description

description
Overlay a logo or image as a watermark with configurable position, opacity, and scale.

Image Watermark

Overlay a logo or secondary image as a watermark on a base image. The watermark is scaled relative to the base image width and positioned at a corner or center.

API Endpoint

POST /api/v1/tools/watermark-image

Accepts multipart form data with two image files and a JSON settings field.

Parameters

Parameter	Type	Required	Default	Description
position	string	No	`"bottom-right"`	Watermark placement: `center`, `top-left`, `top-right`, `bottom-left`, `bottom-right`
opacity	number	No	`50`	Watermark opacity percentage (0 to 100)
scale	number	No	`25`	Watermark width as percentage of main image width (1 to 100)

File Fields

Field Name	Required	Description
file	Yes	The main/base image
watermark	Yes	The watermark/logo image

Example Request

curl -X POST http://localhost:1349/api/v1/tools/watermark-image \
  -H "Authorization: Bearer si_your-api-key" \
  -F "file=@photo.jpg" \
  -F "watermark=@logo.png" \
  -F 'settings={"position": "bottom-right", "opacity": 60, "scale": 20}'

Example Response

{
  "jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/photo.jpg",
  "originalSize": 2450000,
  "processedSize": 2520000
}

Notes

Both images are validated and decoded (HEIC, RAW, PSD, SVG supported).
The watermark is resized proportionally so its width equals scale% of the main image width.
Opacity is applied via an alpha mask composited with dest-in blending.
Corner positions use a 20px padding from the image edge.
If the watermark image has transparency (e.g., a PNG logo), it is preserved during compositing.
EXIF orientation is auto-applied on both images before processing.

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